Fluorescent lighting is far more energy efficient than incandescent lighting, this is because a greater proportion of power is converted to light and a smaller proportion is converted to heat. Fluorescent lamps are available in a wide range of colour rendering properties, the most common being white, warm white or cool white. Although the initial cost of the lamp is more expensive this is more than compensated for by lower energy consumption over its life giving roughly 5 times the light output, a 25w lamp is roughly the equivalent of 125w of incandescent light and will last for at least 10,000 hours.
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps. The lamps use a tube which is curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the base of the lamp. Compared to general-service incandescent lamps giving the same amount of visible light, CFLs use one-fifth to one-third the electric power, and last eight to fifteen times longer. A CFL has a higher purchase price than an incandescent lamp, but can save over five times its purchase price in electricity costs over the lamp's lifetime.
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